NEW YORK -- Donald Trump unleashed a Sunday morning tweet storm on Hillary Clinton over her campaign's decision to join a recount process on voting results in Wisconsin and perhaps other states.

"So much time and money will be spent - same result! Sad" Trump said in one Twitter post.

The president-elect's comments capped a series of tweets in which he quoted Clinton's criticism of a Trump debate comment that he might not recognize the results on the election should he lose. At one point, Trump noted, Clinton described refusal to accept the results of an election as "a direct threat to our democracy."

The Clinton campaign announced Saturday it would participate in a Wisconsin recount sought by Green Party candidate Jill Stein, and may join Stein-backed efforts in Michigan and Pennsylvania. Officials cited voter concerns about Russian hacking and other forms of alleged voting problems.

While Clinton officials said they have seen no evidence of vote tampering, and do not expect the results in any state to change, they believe their campaign needs to be represented during any recount process.

In a post on Medium, Clinton general counsel Marc Erik Elias wrote: "Because we had not uncovered any actionable evidence of hacking or outside attempts to alter the voting technology, we had not planned to exercise this option ourselves, but now that a recount has been initiated in Wisconsin, we intend to participate in order to ensure the process proceeds in a manner that is fair to all sides."

While Trump carried the states of Pennsylvania, Michigan, and Wisconsin by a total of only 107,000 votes, Elias noted that "the number of votes separating Donald Trump and Hillary Clinton in the closest of these states — Michigan — well exceeds the largest margin ever overcome in a recount."

Clinton supporters raised concerns about possible Russian hacking of the election, though the Democratic team and the Obama administration have said there is no evidence of it.

Trump, meanwhile, charged the Clinton campaign with hypocrisy.

"Hillary Clinton conceded the election when she called me just prior to the victory speech and after the results were in," Trump said in one post. "Nothing will change."